Type-writing machine.



N. H. ANDERSON.

TYPE WRITING MACHINE.

APPLICATION FILED MAR-11.1310.

Patented Nov, 23, 1915.

2 HEETS-SHEET I.

l/VVE/WOR N. H. ANDERSON.

TYPE WRITING MACHINE,

APPLICATION nuzn MAR. 17. 1910.

Patented Nov. 23, 1915.

. INVENTOR 1 l ilht lil.

- 'This invention relates to typewriting ma chines, and withreg'ard-tothe more specific i T it TYPEWRITER. COMPANY, or MInnLETowu,couunciicnnn oon oneriolt OF con- NECTIGUT.

TYPE-WRITING. MACHINE-.1 s i Patented th 23', leis,

; Application filed Marchli, 910; "seiia1 Ito; 550,066.'1*

To all whom/it may c0.n0cm1,-."' 1 Be it known that-I, NILsl-l.ANDERSON,

Middletown, in the county of Middlesexand State of Connecticut, andwhose post-oflice use the same.

features thereof, to certain features ,of the, platen shiftingmechanism.

One oftheobjects' of. his invention is toprovide practical and eflicientmeans for i.

nected by means of links 8.;with' a shift rail withfla rock shaftof theshift] Another object isto-provide a device of" the-above character"which will be simple in construction and cheap to manufacture.

A further object is to proficl i a device of the above naturewhereby thebalancing spring maybe easily-andmjnutely ad'usted,

' adjusted positiom 3U and at: the same time' positivelyflocked "in Afurther 'bject' "s; provide a" halancefor the", mechanism{ that will notbe materially altered its work-1 ing limits when actuated.

.- Other objects willhepai't'ohvieus in-parthereinafterpem out".-

; 'The inven 'on-accorly eo= v the *features of 'construm'on,combinations of w thisinventionelements and arrangement cf p whichlie-exemplified: in the i w 'inafter set f0rth,'and the scope ef theapl%- the of cl referee f it i S 11111 i u H: lai- M l it through thesevmnl views of the drags. l V The pres invent! n ma 1 a citizen of theUnited States, residing at" f and with reference 'glan' embodi-Inentl'there'of in the shift mechanism of. a Nolsele'ss typewritingmachineg'f'but it ,is to ,be understood; of coursev that theinventionmaybe applied to any form of typewriting its shi '-ft;.mechanism, eitherof double hifte'f relatively to fa stationary/platen. -Referringtothedrawings detail', 1

mi fihiile using arock shaft in connection" sinde-shiftcr where thetype-"basket is .epifesentsa rock-shaft mounted in suitable trunnions'2. ,qn the. inner .side' of the frame and provided withv a 'yokenearone end thereof in which. is mounted cam mechanism 4c adapted to beactuated by shift keys 5 v 0 and 6 for rotatingthe rock shaft 1 in.0pposite directions; Rigidly "conneoted 'near each 5' e S ft mecha'-'carriage ino'wardly or downwardly for the .purpose 'gof printing"upperor lower case,

type.-: As this mechamsm for-ms no part of the presentinvention, itneednot be further described inc-this application; reference heing:

had 'to 'my. co-pen pplication No.

429, 0s, 'fi1ed April 27,1908; a N areach' end of the rock shaft 1 issecured a'sleeve or bushing, 11 by means ofa set 'screw-12, said s'leehaving a bracket omen-13 in which is niounted .a.we1"n:1 1t.'

Aliscrew head'15 is. provided atone end} thereof 'wherehy the same maybe rotated byim. offa screwdriver or the like-,I

mounted upon I when the worm is rotated; pinion 19 and sleeve 16 willturn also; either in ing orjdec the tension of the sp 1|;

according to the direction in which the worm is turned. lit is to'heunderstood, of a in PP catio" .ofjwhich will he imtedinthe a sleeve or bw I '16 towhich one/end 10" I V V 7 Did 1711 s EttMhGd thB ff, f jfn 1 eaccompan 1 1i wh pppesite endof this connected shdwilfqnefnf various itofany smtahle part of the heme 18, as -mentsof' thisrriiivenhon,-cleatlyshown l g l; 'Secured'to' the elevation eta of a w "h' 1| 3; orsleeve 16 is a-pinioii' 19 (adapted ia t 1 to mesh with the worm '14.][t'is normal position by means of springs 20 connected at one end tothe shift levers 5 and Band at their opposite ends to suitable pins 21on the frame of the machine and locked in that position by the cammechanism 4.

When the carriage is shifted upwardly the weight of the carriage assistsin returning it to its central neutral position so that in this case thereturn spring can be relatively somewhat lighter than when shifting thecarriage to the lower position, in which case the return spring mustovercome the weight of the carriage as well as the balance of themechanism. In this latter case the balancing.

springs act to a certain extent in assisting the return but on accountof their great length there is little or no real eflect from onthe'tension thereof. In some forms of typewriters a common helicalspring has been used for this work but it has heretofore been founddiflicult to introduce a spring of this-type of sufficient length sothat the movement'of the shifting would not result in too .large anincrease or decrease in the tension of the spring. By shifting thecarriage in opposite directions from a normal intermediate position anovertenslon of the balance springs is thereby prevented.

The operation and manner of use of this invention is substantially asfollows: The rock shaft is rotated in one direction or the other,accordingto which shift key is pressed, tograise or lower the carriagein order to print upper or'lower case type. As-

sume that for some reason it is necessary to adjust the tension of thespring, to properly 1 balance the carriage, a screw driver is inmeshingtherewith in one direction or the.

serted in the head 15 of the worm 14 mounted in the bushing 13 fast onthe rock shaft 1, and rotated so as to turn the pinion 19 other, sothatthe tension of the spring is such as to properly. balance the carriagewhen the parts are in normal position. The

' operator will-know when this condition is reached, as it may be.easily determined by "actuating the shift mechanism and noting theaction of the carriage in returning to normal position. Itwill, ofcourse,- benoted .that' it is unnecessary-to loosen any nuts or the likebefore commencing this adjustment or to perform any act whatsoever afterthe f" adjustmenthas been made to, insurethat the parts are securelylocked in adiusted position, as the worm and pinion mechanism is suchthat one looks the other against move- -ment until some exterior, forceis applied thereto. i

It is thus seen that this invention provides for a simple and practicaldevice which will permit accurate adjustment of the parts with the leastamount of trouble, and also that the adjusting means is locked in itsadjusted position the instant that position has been reached. 4

As many changes could be made in the above construction and manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrative and not in a limiting sense.

1 Having described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a typewriting machine, in combination, shift mechanism including arock shaft,

a balancing spring on said rock shaft, a pinion connected with one endof said spring,

and a worm fast on said shaft meshing with said pinion whereby thetension of the spring may be varied.

2. n a typewriting machine, in combination, a rock shaft, a sleeve onsaid shaft, a balancing spring, one end of which is connected with theframe of the machine and the other to said sleeve, and means forrotating said sleeve whereby the tension of said sprin is varied.

n a typewriting machine, in combination, arock shaft, a sleeve on saidshaft, a balancing spring, one end of which is connected with the frameof the machine and the other to said sleeve, and worm and pinionmechanism for turning said sleeve whereby the tension of said spring isvaried.

4. In a typewriting machine, in combination, a rock shaft, a sleeve onsaid shaft, a balancing spring, one end ofwhich is connected with theframe of the machine and 5. In a typewriting machine, in combination, .arock shaft, a sleeve on said shaft, a balancing spring, one end of whichis connected with the frame of the machine and the other to said sleeve,a pinion connected -with said sleeve, an ear rigidly secured to saidshaft, a worm carried thereby androtatably connected therewith, andmeans for rotating said worm whereby saidpinion is turnedto vary thetension of said spring.

6. In a typewriting machine, in combination, acarnage, a rail alongwhich said carmerger riage travels and which is shiftable in oppositedirections from a normal central position, a rock shaft, intermediatemechanism for transmitting motion from one to the other, sleeves onsaid. shaft, a spring connected at one end to each sleeve and havin itsother end connected to the frame, an

means for rotating said sleeves whereby thetension of the springs isvaried.

8. In a typewriting machine, in combination, a carriage, a rail alongwhich said carriage travels and which is shiftable in oppositedirections from a normal central position, a rock shaft, intermediatemechanism for transmitting motion from one to the other, sleeves on saidshaft, a spring connected at one end to each sleeve and having its otherend connected. to the frame, and worm and pinion mechanism for turningsaid sleeves whereby the tension of the springsis varied.

9. In a typewriting machine, in combination, a carriage, a rail alongwhich said carriage travels and which is shiftable in opvpositedirections from a normal central position, a rock shaft,intermediate mechanism for transmitting .motion from one to the other,sleeves on said shaft, a spring connected at one end to each sleeve andhaving its other end connected to the frame, a pinnation, a carriage, arail along which said thereby, and means for rotating ion rigidlyconnected with each sleeve, and worms connected with said shaft adaptedto rotate the pinionswhereby the tension .of the springs is varied.

10. In a typewriting machine,- in combicarriage travels and which isshiftable in opposite directions from. anormal central position, a rockshaft, intermediate mechanism for transmitting motion from one to theother, sleeves on said shaft, a spring connected atone end to eachsleeve and having its other end connected to theframe, a pinionconnected with each sleeve, ears rigidly secured to said shaft, wormscarried said worms whereby said pinions are turne to vary the tension ofthe springs.

' 11. In aftypewriting machine,-in' combination, ashiftable carriage, arail on which said carriage'travels, a-rock shaft, intermediatemechanism between the rock shaft and said rail,- a sleeve on said shaft,a having one end connected with sald aleeve and the other with theframe, and means for adjusting the tension of said spring.

'12. In a t'ypewriting machine, in combination, a vertically shiftablecarriage, a rail on which said carriage travels, a rock shaft,intermediate mechanism between the rock shaft and said rail, a sleeve onsaid shaft, a spring having one end connected with said sleeve and theother with the frame, and means whereby the tension of said spring isvaried. L 13. In a typewriting machine, in combination, a shiftablecarriage, a rail on which said carriage travels, a rock shaft,intermediate mechanism between the rock shaft and said rail, a sleeve onsaid shaft, a spring having one end connected with said sleeve and theother with the frame, and worm and pinion mechanism whereby the tensionof .said spring is varied.

'14. In a typewrltlng machine, in combination, a shiftable carriage, arail on which said carriage travels, a rock shaft, intermediatemechanism between the rock shaft and said rail, a sleeve on said shaft,a spring having one end connected with said sleeve and the other withthe frame, a pinion rigidly connected with said sleeve, and a Wormconnected with said shaft adapted to rotate the pinion whereby thetension of said spring is varied.

15'. In a typewriting machine, in combination, a shiftable carriage, arail on which said carriage travels, a rock shaft, intermediatemechanism between the rock shaft and said rail, a sleeve on said shaft,a spring having one end connected with said sleeve and the other withthe frame, a pinion con- 16. Ina typewriting machine, in combination,shift mechanism including a rock shaft, a sleeve onasaid shaft, a springhaving one end connected to said sleeve and the other to a relativelyfixed part of the machine, apinion connected with said sleeve, and asingle means for adjusting the tension of said spring through saidpinion and look ing the same in adjusted position.

17 In-a typewriting machine, in combination, shift mechanism including arock shaft, a sleeve on said shaft, a spring having one end connected tosaid sleeve and the other to a relatively fixed part of the machine, apinion connected with said sleeve,

.and a worm meshing with said pinion for rotating the same to adjust thetension of said spring and lock the same in adjusted position.

18. In a typewriting machine, in combi- T nation, shift mechanismincluding a rock shaft, a sleeve on said shaft, a spring having one endconnected to said sleeve and the other to a relatively fixed part of themachine, a pinion connected with said sleeve, a bushing, fast onsaidrock shaft, and a worm carried thereby meshing with said pinion foradjusting the spring and locking the same in adjusted position.

19. In a typewriting machine, in combination, a rotatable shaft, aspring about said shaft adapted to return the same to normal positionwhen tensioned, a sleeve on said shaft to which said spring is connectedat one end, a pinion on said sleeve, and means meshing with said pinionfor rotating the same to adjust the tension on said Sp 20. In atypewriting machine, in combination, a rotatable shaft, a spring aboutsaid shaft, a sleeve on said shaft to which said spring is connected atone end, a pinion on said sleeve, and means adapted to mesh with saidpinion to rotate the same to vary the tension on said spring.

21. In a typewriting machine, in combi-' nation, a rotatable shaft, aspring about said shaft. a sleeve on said shaft to which said spring isconnected at one end, a pinion on said sleeve, a second sleeve, and aworm mounted thereon adapted to mesh with said pinion to rotate the sameand vary the tension of said spring.

22. In a typewriting machine, in combination, a rotatable shaft, aspring about said shaft, a sleeve on said shaft to which said spring isconnected at one end, a pinion mounted on said sleeve, a second sleevefast on .said shaft, and a Worm carried thereby adapted to mesh withsaid pinion to rotate the same and vary the tension of said spring.

23. In a typewriting machine, in combination, a rotatable shaft, aspring about said shaft, a part of said shaft towhich said spring isconnected at one end, a pinion mounted on said sleeve, a second part onsaid shaft, and a Worm carried thereby 1 'by said worm may be rotated. I

In testimony whereof I affix my signature, in the presence of twowitnesses.

NILS H. ANDERSON.

Witnesses EDMUND H. CLARK GRACE E. FLADNDEQS. 1

